15. Water is draining from a small cylindrical tank into a larger one below it. The small cylindrical tank has a radius of 4 feet and a height of 6 feet; the large cylindrical tank has a radius of 8 feet and a height of 16 feet. The small tank is initially full of water, and the water drains out at a rate of % cubic feet per second. Note: The volume of a cylinder is V = Web. A. Find the volume V3 of the water remaining in the small tank as a function of time. B. How long does it take for the small tank to completely empty? C. Let 2 be the depth of the water in the large tank, which is initially empty. Compute %. D. What fraction of the total amount of water is in the large tank at time t = 6